test_mmap wrote null bytes into its expected-output file; this caused me to

waste an hour tracking down an illusion; repaired it; writing/reading non-
printable characters (except \t\r\n) into/outof text-mode files ain't
defined x-platform, and at least some Windows text editors do surprising
things in their presence.
Also added a by-hand "build humber" to the Windows build, in an approximation
of Python's inexplicable BUILD-number Unix scheme.  I'll try to remember to
increment it each time I make a Windows installer available.  It's starting
at 2, cuz I've put 2 installers out so far (both with BUILD #0).

Lib/test/test_mmap.py

@@ -40,7 +40,7 @@ def test_both():
     assert m[0] == '3'
     print '  Contents of first 3 bytes:', repr(m[0:3])
     assert m[0:3] == '3\0\0'
-    print '  Contents of second page:',  m[PAGESIZE-1 : PAGESIZE + 7]
+    print '  Contents of second page:',  repr(m[PAGESIZE-1 : PAGESIZE + 7])
     assert m[PAGESIZE-1 : PAGESIZE + 7] == '\0foobar\0'
     
     m.flush()
@@ -119,4 +119,3 @@ def test_both():
     print ' Test passed'
 
 test_both()
-

PCbuild/python20.dsp

@@ -694,8 +694,12 @@ SOURCE=..\Modules\getbuildinfo.c
 
 !IF  "$(CFG)" == "python20 - Win32 Release"
 
+# ADD CPP /D BUILD=2
+
 !ELSEIF  "$(CFG)" == "python20 - Win32 Debug"
 
+# ADD CPP /D BUILD=2
+
 !ELSEIF  "$(CFG)" == "python20 - Win32 Alpha Debug"
 
 !ELSEIF  "$(CFG)" == "python20 - Win32 Alpha Release"